<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>初识</title>
    <script type="text/javascript">
        alert("啊哈哈");
        console.log("日志信息");
        console.info("控制台信息");
        console.warn("警告信息");
        console.error("错误信息");
    </script>
</head>
<body>
</body>
</html>